Spraying apparatus.



PATENTED AUG. 1l, 1908. E. P. SAMPSONt SPRAYING APPARATUS.

APPLICATION FILED MAY 24, 1907.

asses:

UNITED sTATEs PATENT oEEIoE.

EMERSON F. SAMPSON, OF PLYMOUTH, MASSACHUSETTS.

SPRAYING APPARATUS.

Specification of Letters Patent.

Patented Aug. 11, 1908.

Application iled May 24, 1907. Serial No. 375,440.

difliculty is encountered in preventing the` poisoning matter,'which isof greater specific.

gravity than the water, from settling to the bottom of the tank, as itwill do, unless `the contents of the tank are violently agitated at alltimes. In order to maintain a mixture of water and poisoning material ofthe desired proportions various devices for mechanically agitating themixture have been employed which require the expenditure of considerablepower and which, moreover, are not as effective as desired, for thereason that usually a thick layer of the poisoning material becomesdeposited on the bottom of the tank before it is emptied.

The object of my invention is to provide a tank, of the character abovereferred to, with means whereby the contents of the tank will beconstantly stirred and prevented from settling on the bottom during thetime when the liquid is being discharged from the tank, without theemployment of mechanical mixing devices.

F'or an understanding of the means which I employ in carrying out myinvention reference is made to the accompanying drawing, in which,

Figure l is a side elevation, partly in central section, of acompressed. air tank provided with my invention. Fig. 2 is a horizontalsectional view on the line 2 2 of Fig. 1. Fig. 3 is an enlarged detailvertical sectional view of the injector mechanism. Fig. 4 is a detailsectional view of a modified form of my invention. Fig. 5 is a plan viewof the devices shown in Fig. 4. Figs. 6 and 7 are detail sectional viewson the lines 6 6 and 7 7, respectively of Fig. 2.

The tank a, which I preferably employ is cylindrical in form, or isprovided with curved Walls, so that a whirling motion or circular flowof the liquid-therein may be easily caused and maintained, and is alsoprovided with a concave bottom a', so that the lowest point in the tankis at the center thereof. An air-tight top a2 is provided on said tank,said top being provided with a central opening and being preferablyconcave, as shown, to enable the tank to be readily filled, said openingbeing adapted to be tightly closed by a screw plug Z. A dis-- chargepipe c is connected to the tank adj acent its bottom'so that it willalways be below the liquid level in the tank, and the bottom a of thetank is provided with a central outlet opening at its lowest point, inwhich aV nipple d is secured. The'flange of said nipple is preferablyflush with the inner surface of the bottom, so that the tank may becompletely drained therethrough, and there will be vnothing to impedethe downward flow thereto.

An injector e, comprising an inlet branch e', va nozzle e2, an airsupply branch c3 and a discharge branch e4, is provided, said branch ebeing connected to the nipple d, and said branch e3 being connected toan air supply pipe g, and leading into the nozzle e2, which extends pastthe branch e into the discharge branch e4. A drain plug f is preferablyprovided in the under side of the ejector, as shown, for cleaningpurposes. A circulating or discharge pipe h is connected at one end tothe discharge branch e4, and is extended beneath the bottom of the tankup to the side thereof in a gradual curve, where it is connected at itsother end to one end of a chamber fi, which is secured to the outer sideor wall of the tank. The outer side of said chamber vi tapers graduallyfrom the end to which pipe 7L is connected to the side of the tank and aport or opening a3 is provided in the wall of the tank adjacent thepoint of connection of said side with the tank. A deiiector plate I: isconnected to the inner wall of the tank adjacent said port a3 andextends over said port in a direction approximately parallel to and at ashort distance from the wall, as shown in Fig. 2, so that waterdischarged from the chamber 'i into the tank will be projected thereintangentially, said deflector plate being so disposed that it does notinterfere with a circular whirling motion of the liquid in the tank.Under some conditions it is desirable to provide one or more branchpipes which lead from the pipe h to the bottom of the tank. As indicatedin Figs. 2 and 6, l provide two branch pipes m and m which lead frompipe 7i to chambers n, n, respectively, said chambers being similar inconstruction to chamber i and secured to the under side of thetank insubstantially the same manner as said chamber i is secured to the side.In like manner said chambers n, a are respectively connected to the tankthrough ports a4, c, in the bottom thereof, deflectors 0, 0 beingrespectively mounted on the tank bottom and extending over said openingsin the direction of the bottom so as to direct the jets therefrom alongthe bottom of the tank. The port a4 is shown as located approximatelymidway between the center of the bottom of the tank and the side walland the port a5 closely adj acent said wall.

In operation the tank is partly filled with water and the poisoningmaterial and is then hermetically closed. An air pump p, or other meansfor supplying air under pressure, is connected to the pipe g and air israpidly forced through said pipe and the nozzle e2. Acting on theprinciple of the ordinary injector, this air jet'will act to draw theliquid from the tank through the inlet branch c and force the same alongthrough the pipe h up into the chamber 'i whence it will be discharged,with the air, through the port a back into the tank. The jet of liquidand air which will be forced through the port a will be directed intothe tank tangentially, by the defiector 7, causing the liquid therein towhirl or move circularly. This whirling motion prevents to a greatextent, the settling of the poisoning material in the tank upon thebottom. ln addition to the circular current thus produced, the jet,which is delivered from the opening a3 will have a scouring action uponthe bottom, tending further to prevent settling of the heavy material.At the same time there will be a flow from the walls to the center ofthe tank, on account of the fact that the liquid will be constantlydrawn in through the port in the middle thereof, so that the liquidwill, therefore, circulate spirally. Moreover, as the bottom of the tankis inclined towards the center, the heavier matter, which settles on thebottom, will gravitate towards the center, this gravitation beingmaterially assisted by the cross current which is thus created, with theresult that the matter which settles on the bottom will be conductedinto the injector and will be carried around through the pipe t anddischarged back into the tank. The result is that a constant agitationand circulation of the liquid in the tank is secured which tends tocause the poisoning material to be uniformly distributed or held insuspension in the liquid, and to prevent the settling of the heaviermatter on the bottom.

The jets from the ports a4, a act to accelerate the flow between thewalls and center and also aid in scouring. the bottom of the tank.

While l have -shown a main discharge passage from the injector in thewall, and two others in the bottom, the precise number and location ofsaid passages depend largely on conditions such as size of tank andforce Land rapidity of the air supply. Under some conditions it may befound desirable to employ only one discharge passage and to have-thatlocated in the bottom near the side wall, as indicated by port a5 andchamber n. The exact direction in which the jets shall be proj ected isalso a matter of expediency to some extent, for, although they shouldact to cause a constant circulation of the liquid under all conditions,the direction of a jet inwardly would aid in washing the heaviermaterial into the middle outlet.

In Figs. 4 and 5 l show a modified form of my invention in which thecirculating pipe is wholly within the tank. In this form the air inletpipe g leads through the side wall of the tank and is connected to anozzle q which is inserted in the end of a circulating pipe r, said pipehaving a branch or inlet pipe r extending downwardly therefrom to apoint adjacent the bottom of the tank near the middle thereof, and saidnozzle extending past the point where said branch leads into the mainpipe, as in the ordinary injector. Said pipe r is extended to the wallof the tank in a curved direction and is provided with a nozzle r2 atits end which is disposed to direct the jet therefrom circularly of thetank. Branches r3 and r4 may also be provided in the pipe r, as shown inFig. 5. The operation of this form of my invention is substantially thesame as that already described, air under pressure being forced throughthe nozzle (1 and causing the liquid in the tank to be drawn in throughthe branch r and discharged through the nozzle r2 and the branch nozzlesr3 and r4, creating a whirling motion of the liquid in the tank andpreventing the heavier material from settling to the bottom thereof bysaid whirling motion and the scouring action of the jets on the tankbottom. While this form of my invention is less expensive ofconstruction than the other form, it is less effective in operation, asthe pipes in the tank impede the whirling-motion and the heavier matterwhich settles to the bottom is drawn into the circulating pipe lesseffectively.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is l. A compressed-air, spraying tankcomprising a circulating pipe in open communication with said tank atdifferent points, a nozzle disposed to direct a jet through the pipe,and means folI forcing air under pressure through said nozzle to drawthe liquid of the tank into said pipe at oneof said points and dischargeit at the other and to raisel oi' maintain the air ressure in the tank,substantially as described.

2. In combination with a tank having curved side walls to permitunobstructed, circular flow therein, and having a circulating passageconnected at each end-to said tank and arranged to conduct the liquid inthe tank from the middle towards the walls and discharge the same in adirection to cause a circular iiow in the tank, andl means for forcingthe liquid through said passage to cause said circular flow and a returnflow from the walls to the middle, substantially as described.

3. In combination with a circular tank, mixing means therefor comprisingmeans for drawing the liquid from the tank at one point and dischargingit thereinto at another point in a direction to cause a circular motionof the liquid therein, said point of withdrawal being located centrallyof `the tank and the point of discharge being adjacent the wallsthereof, so that the liquid is caused to circulate spirally within thetank substantially as described.

4. In combination with a circular tank having itsbottom inclined to thecentral portion thereof, means for drawing the liquid from the tank at apoint adjacent the lowest portion therein and discharging it back intothe tank adjacent the bottom and walls and in a direction to cause acircular motion of the liquid in the tank, substantially as described.

5. A compressed-air, spraying tank comprising a circulating pipeconnected to said tank at different points, a nozzle leading into saidcirculating pipe adjacent one end and disposed to direct a jet throughthe pipe towards the other end, and means for forcing air under pressurethrough said nozzle to cause a circulation through said pipe and toraise or maintain the air pressure in the tank, substantially asdescribed.

6. A conipressed-air, spraying tank comprising an injector disposed todraw liquid from the tank at a point adjacent its bottom, a pipe leadingfrom said injector and discharging into the tank in a direction to causea circular flow therein and means for conducting air under pressure intosaid injector, substantially as described.

7. In combination with a circular tank, means for drawing the liquidtherein from the middle portion thereof and forcing it back into thetank at a point between the central portion and wall and adjacent thebottom thereof in a direction circularly of the tank to cause a circularand inward flow of the liquid, substantially as described.

8. In combination with a tank having a circulating pipe connectedthereto at points adjacent the center of its bottom and its side, anozzle extended into said pipe in a direction to cause a huid jetdischarged therethrough to draw the liquid from the middle of the tankinto said pipe and return it to the tank at the side thereof, andnieans'at the discharge end of the pipe for directing the iiow along thebottom of the tank in a direction to cause a circular iiow of theliquidtherein, substantially as described.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

EMERSON F. SAMPSON.

' I/Vitnesses:

B. A. HATHAWAY, Trios. L. CAssiDY.

